I generally check my lenses and filters for cleanliness at home on slow evenings after an outing. I hate finding fingerprints on the glass just before taking a photograph, almost as much as finding them just afterwards. I don't clean my lenses unless they need it, and I'd much rather clean them at home than in the field.
I also keep a handy list of curse words so I'll know just what to say when I pull the dark slide before closing the shutter. Otherwise, I have to go through so many...
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